Contains identification information for the standard being cited, wherever in the document the standard is cited, for example, in a normative reference list, in a bibliography, in the narrative text, or in a section title. Within a reference list,the <std> element is one of the three legal types of citations, serving as a standard-specific alternative to the <mixed-citation> and <element-citation> elements.
Any combination of:
Text, numbers, or special characters
Emphasis Elements
Inline Display Elements
Baseline Change Elements